When a portal opens in Ginza, Tokyo, a modern Japanese Self-Defense Force unit repels a fantasy invasion that spills into the city. Pursuing the invaders, Itami Youji leads a small expedition into the other world, forging uneasy alliances with its rulers and new allies like Rory Mercury, Lelei La Rhea, and Tuka Luna Marceau. The series blends military action, political intrigue, and light otaku humor as two worlds collide and the fate of both hangs in the balance.

When a portal opens in Ginza, Tokyo, a modern Japanese Self-Defense Force unit repels a fantasy invasion that spills into the city. Pursuing the invaders, Itami Youji leads a small expedition into the other world, forging uneasy alliances with its rulers and new allies like Rory Mercury, Lelei La Rhea, and Tuka Luna Marceau. The series blends military action, political intrigue, and light otaku humor as two worlds collide and the fate of both hangs in the balance.